An exchange of captured agents with the Soviets goes sour.
| Name | Type | Role | |
|---|---|---|---|
| Bill Craig | Writer | ||
| Richard Hurndall | Guest Star | ||
| Geoffrey Chater | Guest Star | ||
| Patrick O'Connell | Guest Star | ||
| Harold Innocent | Guest Star | ||
| Andrew Sachs | Guest Star | ||
| Trisha Noble | Guest Star | ||
| Peter Duguid | Director |